Improved steam street-car



gaat est THOMAS C. ROBINSON AND GEORGE P. CLARK, OF BOSTON, MAS-SACHUSETTS.

Lette/ rs Patent No. 85,331, dated December-29, 1868.

To all whom it may concern.-

Be it known that we, TnoMAs Q .Ronrnson and GEORGE P; CLARK, both ofBoston, in the county of Suffolk, and State of Massachusetts, haveinvented a new and improved Mode of Connecting and Operating the BoilerIof a Steam Street or other Car `with the Truck and Frame of the Car; andwe do hereby declare that the following is a full and exact descriptionof the same, taken in connection withthe accompanying drawings, withletters of reference marked thereon.

The nature of our invention consists in using the boiler of our car as atransient bolt, thus permitting the car-truck to turn on curves andswitches, Without intenering with the supply of steam from the boiler tothe propelling steam-cylinders, and certaindev'ices to facilitate this.

In the drawings- Figure l is a vertical longitudinal section of the car,with a side view4 of the boiler inside of the truck, and Wheels, with 'apart of thecylin'der.

Figure 2 isa vertical longitudinal section of the car,

vand of the outer portion of the'boiler, (with part of its lower portionomitted, to show'what we call the transient ling.) and of the truck,with a side view of the wheels, cylinder, and connecting-rods p'.

Figure 3 is a View from the top, of the car-frame surrounding theboiler, with the transient ring and its rollers round the boiler, andits trunnions; also the inner transient ring.

In jigs. 1, 2, and 3, C is the boiler, upright, resting on thetruck-frame L, and forming' a transient bolt for the car.

D is the inner transient ring, (which We 'sometimes dispense With,)fastened round the outside of the boiler, and supporting it on thetruck-frame L.;

E is the outer transient ring, made in two sections,y

the line of division being horizontal, and is supported by twotrunnions, G G, on each side, upon the carframe.

E F are eight metallic cylindrical rollers, held with their axesvertical, firmly, but so. as to admit rotation by the two sections ofthe outer transient ring. The rollers (instead of' which I sometimes useballs) project beyond the inner surface of the ring, and impinge uponthe inner transient ring, round the boiler, as seen in iig. 3. Theirobject and eii'ect are to diminish friction, when any change indirection of the truck, asin going round a curve, causes the truck topartially rotate round the boiler. 1We sometimes fasten these rollers orballs upon the boiler, and let them rotate upon the 'inner surface (in agroove therein) of the transient ring.

G G, fig. 3, are two trunnions, iirmly attached to the and respectivesides of tlie'outer transient. ring, and wor-kingin bearing on thecar-frame. These permit the ring to oscillate.

H H are the ordinary car-rolls, secured firmly to the truck-frame.

I I, iig. 3, are the timbers of the car, which rest on the truck-frame,with the car-rolls intervening.

J, figs. 1 and 2, is a steam cylinder, used to rotate the wheels,fastened to the truck-frame underthe front part of the car. There aretwo of these, one ou each side, and they maybe placed either inside oroutside of the truck.

K is the cross-head and slide, attached to the cylinder.

L' L is the frame ofthe truck.

M M, tig. l, are rubber springs,A beneath the housing, resting on theIjournals ofthe axles'.

N, fig. 2, is the parallel rod, connecting the driving and forwardwheels.

O is the connecting-rod to-the cross-head Y -P P are two projections ofmetal, fastened iirmlyto the outer transient ring E, on the front andback side. These play in a slot or groove of the car-frame, and theiruse is to takeoii` from the trunnions and their bearings the strainoccasioned by any-sudden advance or recession of the car, acting uponthe momentum or the inertia of the boiler. They arecalled the drawbars.

he mode of operation of our device is evident without furtherexplanation.

We sometimes support the boiler upon the car-body,

and let. thecar-truck rotate around the lowerend of it;

What we claim herein as new, ,of 'our invention, and desire to secure byLetters Patent, is-

l. In locomotive-cars, the use of the boilerl as a iransient bolt, whenarranged and used substantially as dc scribed.

2. In locomotive-cars, when the boiler is used as a transient bolt, thetransient ring, and the rollers 'to di; minish friction, whether with orwithout the inner ring, all substantially as described.

' 3. In locomotive-cars, with the boiler, transient bolt, and frictionrollers, and transient ring, above described,

the use of trunnions on the transient ring, all substantially as and forthe purpose described.

THOMAS C. ROBINSON. GEO. P.' CLARK. Witnesses:

LEMUEL P. JnNKs, WM. T. SHEPLEY.

